Phonograph-transmitter.



H. C. EGERTON.

PHONOGRAPH TRANSMITTER.

APPLICATION FILED NOV. 25, 1914.

1,246,895. Patented Nov. 20, 1917.

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PHONOGRAPH TRANSMITTER.

APPLICATION FILED NOV. 25. 1914.

Patented Nov. 20, 1917.

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UNITED STATES PAT T OFFICE.

HENRY c. EoEnroN, or rassarc, NEW JERSEY, AssIcNon, BY rmsNnASSIGNMENTS, T0 wns'rEaN ELECTRIC COMPANY, xNconron-nrnn, A conronarroor ew 203x.-

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Patented Nov. 20, 191 '1.

Application and November 25,1914. Ser1al1Io.878,861.

To all whom it may concern: Y

Be it known that I, -HENRY O. Eonn'roN, a citizen of the United States,residing at Passaic, in the county of Passaic and State of NewJersey',-'have invented certain new and useful Improvements inPhonograph- Transmitters, of which the following is a full, clear,concise, and exact descriptlon.

-This. invention relates to transmitting apparatus, and moreparticularly to a transmitter for transmitting to a circuit thevibrations of a phonograph record.

The object of this invention is to provide a com act and eflicientstructure of this class in 'WhlCh the various elements are mounted in. aunitary structure and are constructed and combined .to produce the bestoperation. According to one feature of this invention the resistancevarying means, the stylus and a motion reducing lever system fortransmitting the movement of the stylus to the resistance varying meansare all carried by a sin le compact casing.

cans are also provided for transmitting to the resistance varying meansonly push and pull impulses, caused by the engagement of the stylus withthe sound reproducing undulations. This feature consists in the'use of aconnecting means between the stylus and the lever system, whichconnecting means is rigid with respect to push and pull vibrationsapplied thereto longitudinally, but is flexible with respect tolaterally applied vibrations.

A third feature of the invention relates to the means provided foradjusting the transmitter structure to different angular positions,whereby the stylus may receive and transmit to the resistance varyingmeans either lateral or vertical vibrationsreceived from a record inorder that the device may be operated with either of the forms ofcommercial records...

tion- Figure 1 is a front elevation view with the casing removed of adevice embodying this invention;

Fig. 2 is a cross-section of the device shown in Fig. 1; r

Fig. 3 is a bottom view-of the device; Fig. 4 is a rear elevation viewof the device with the casin removed; I

Fig. 5 is a detai pers ective view showing the arrangement of t e leversystem;

In the drawings illustrating this inven-- Fig. 6 is a view in sideelevation of a sup-- porting arm with the device shown in oneof itsangular positions; a Fig. 7 1s a plan view of a record with which thedevice works when in the position shown in Fig. 6;

Fig. 8 is a view in side elevation of the device in a diiferent angularposition from,

that shown in Fig. 6; v

Fig. 9 is a sectional view of the record with which the devicecooperates when in the position shown in Fig. 8; and I Fig. 10 is adetail view of the mounting for the device. a

- In the drawings, 5 designates a frame memberhavinga centrally locatedweb or plate 6 in which ar'e mounted two transmitter buttons. Eachtransmitter button comprises a container 7, a .stationary electrode 8, amovable electrode 9 and a resistance varying medium 10 located betweenthe statlonary and movable electrodes. Mounted upon the web 6 is abridge piece 12', which supports a lever 13, said lever being supportedupon said bridge piece 12 by means of pivoting screws 14,141. The end ofthe lever 13 is connected with the movable electrode 9 of one of thetransmitter buttons, the movable electrode 9 of the other button beingconnected to said lever upon the oppo site side of its pivotal support.The other end of the lever 13 is extended, as shown at '15, and .isconnected with a second lever 16 frame-member 5 by means of screws 20and I 21 which engage the frame member 5. Inserted between the bottomface of the lever 16 and the heads of the screws 20 and 21 are rubberbuffer members 22, 22, the purpose of these buffers being to eflicientlydampen the movement of the-vibratory member or stylus 17. In order tomake the operation of v these buflers more positive and their posi.-.tion more -important mechanically, the

which is sufliciently stifi" to resist flexure when push and pullvibrations are applied longitudinally thereof, but flexing readily inresponse to transversely applied vibrations. This connecting meansextends through a slot 28 in a post or extension 29 carried by the lever16 and is secured therein preferably by applying a drop of solderthereto. The post or extension 29 is shorter than that portion of thestylus 17 which extends below the lever 16 for engagement with therecord of the phonograph, whereby the vibrations of said stylus, inresponse to the record, are reduced in amplitude'in their transmissionto the lever 13. Byreason of the above described characteristics of theconnecting member 25, the vibrations set up in the stylus byirregularities in the record other than those designed to operate on thestylus, and particularly such irregularities as tend to vibrate thestylus in a direction other than the direction in which it is to bevibrated by the reproducing undulations, will not be transmitted to thetransmitter buttons, thereby eliminating undesirable and confusingsounds which might other- I wise be transmitted.

End members 35 and 36 secured to the frame plate 5 inclose thetransmitter buttons and form with said frame plate 5 a complete casing.Secured to the end member 35 and extending therefrom is a bracket member38 which is provided with an opening adapted to receive the end of abracket arm 39, which is screw-threaded to receive a thumb nut 40. Theupper face of the bracket member 38 is provided with two notches orrecesses 41 and 12 extending at approximately right angles to eachother, and adapted to separately engage a projection i3 provided on acollar 44 on the end of the bracket arm 39. When the transmitter is inthe position shown in Fig. 6 with the notch or recess 42 engaging theprojection 4.3, the lever system will be in such a position that lateralmovements applied to the stylus by a record will swing the lever 16about its pivots and transmit vibrations to the transmitter buttons, inaccordance with the lateral undulations of the record. By loosening thethumb nut 40 and swinging the transmitter through an angle ofapproximately ninety degrees until the notch 41 engages the projection43 on the collar 44 and clamping the device in position, verticalvibrations applied to the stylus will cause'the lever 16 to swing aboutits bearings, and transmit to the transmitter buttons movements inaccordance with the vertical undulations in a record with which thestylus engages.

The bracket arm 39 is pivotally mounted upon bearing member 50-to swingin a vertical direction, said bearing'member 50 being pivotallysupported in a forked member 51 to swing laterally. A member 52 isprovided for retaining the transmitter in an elevated position when itis removed from the record.

In order to more fully insure against undesirable vibrations in thetransmitter sys tem, rubber bushings 56 are provided between the bracketmember 38 and the end member 35.0f the'casing.

The movable electrodes of the transmitter buttons are connected by meansof conductors 60 and 61 with binding screws 62 and 63, while the circuitconnection for the 'stationary electrodes is through the framemember 5to which is secured a binding screw 64.

Three conductors 65, 66-and 67 are connected with binding screws orposts 62, 63 and 64.

What is claimed is:

1. In a phonograph transmitter, a main lever arm, a microphonic elementactuated thereby, an auxiliary lever arm, pivotal supporting meanstherefor, a stylus carried by said auxiliary lever arm, and'a resilientrod rigidly secured to and connectingsaid lever arms and extending atright angles thereto whereby vibration of said stylus in a directionparallel with said rod will be transmitted to said main lever arm andvibrations of said stylus in a direction transverse to said rod will notbe transmitted to said main lever arm.

2. In a phonograph transmitter, a main lever arm, two microphonicelements actuated thereby, pivots for the main lever arm locatedintermediate said-microphonic elements, an auxiliary arm, a pivotalsupporting means therefor, a stylus carried by said auxiliary lever armand a resilient rod connecting said lever arms and extending at rightangles thereto whereby vibrations of said stylus in a direction parallelwith said rod will be transmitted to said main lever arm and vibrationsof said stylus in a direction transverse to said rod will not betransmitted to said main lever arm.

3. In a phonograph transmitter, a main lever arm, a microphonic elementactuated thereby, an auxiliary lever ,arm extending in a plane parallelto said main lever arm, pivotal supporting means for said auxiliarylever arm, a stylus carried by said auxiliary lever arm and a resilientrod connecting a stylus carried by said auxiliary lever arm and aresilient rod connecting said lever arms and extending at right anglesthereto whereby vibrations of said stylus in a direction parallel'tosaid rod will'be transmitted to said main lever arm and vibrations ofsaid stylus in a direction transverse to said rod will not betransmitted to said main lever arm.

5. In a phonograph transmitter, a supporting framework, a main leverarm, a microphonic element actuated thereby, an

auxiliary lever arm comprising a stylus arm and a mounting plate, meansto pivot said mounting plate on sa1d supporting framework, resillentmeans for holding said plate in engagement with said pivoting means anda resilient rod connectingsaid main and auxiliary lever arms andextending at right angles thereto, whereby vibrations of said stylus ina direction parallel with said rod Will be transmitted to said mainlever arm and vibrations of said stylus in a direction transverse tosaid rod will not be transmitted to said lever arm.

6, In a phonograph transmitter, a vvariable resistance, means includinga granular resistance material and electrodes coacting therewith, astylus to engage a phonograph record, a lever system connecting saidstylus with said variable resistance means, supporting means for saidlever stem, means to change the angular positlon of said lever means anda stylus relative to said supporting means whereby the vertical ortransverse movements of said stylus will be transmitted to saidresistance means; said resistance means being arranged so that saidelectrodes extend in a substantiall upright position'whether said stylusis positioned for vertical or transverse movement.

In witness whereof I hereunto subscribe my name this 23d day ofNovember, A. D.

HENRY C. EGERTON. Witnesses:

E. EDLER, K. L. Sum.

